126.96.36.199 PidLidFlagRequest Property
The PidLidFlagRequest property ([MS-OXPROPS] section 2.136) specifies user-supplied text to be associated with the flag that is set on the Message object. If the user does not supply a value, this property is set to "Follow up". This property SHOULD NOT exist on a meeting-related object.
The client ignores the PidLidFlagRequest property if the PidLidFlagString property (section 188.8.131.52) is set to a nonzero value. The server always uses the PidLidFlagRequest property.